I'm still learning a lot about this specification and driver, so I can
only be of limited help on this:
The STAC9220 by default has an absurdly low output volume. The
FreeBSD driver has a fixup for this. I have a STAC9221, and it has
the same problem.
http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/dev/sound/pci/hda/hdac.c?rev=1.24&content-type=text/x-cvsweb-markup
Search for 'softpcm' in the file to see the relevant bits. The code
that does the work is this:
/*
* XXX Temporary quirk for STAC9220, until the parser
* become smarter.
*/
if (id == HDA_CODEC_STAC9220) {
mask |= SOUND_MASK_VOLUME;
while ((ctl = hdac_audio_ctl_each(devinfo, &i)) !=
NULL) {
if (ctl->widget == NULL || ctl->enable == 0)
continue;
if (ctl->widget->nid == 11 && ctl->index == 0) {
ctl->ossmask = SOUND_MASK_VOLUME;
ctl->ossval = 100 | (100 << 8);
} else
ctl->ossmask &= ~SOUND_MASK_VOLUME;
}
} else if (id == HDA_CODEC_STAC9221) {
mask |= SOUND_MASK_VOLUME;
while ((ctl = hdac_audio_ctl_each(devinfo, &i)) !=
NULL) {
if (ctl->widget == NULL)
continue;
if (ctl->widget->nid == 2 && ctl->index == 0) {
ctl->enable = 1;
ctl->ossmask = SOUND_MASK_VOLUME;
ctl->ossval = 100 | (100 << 8);
} else if (ctl->enable == 0)
continue;
else
ctl->ossmask &= ~SOUND_MASK_VOLUME;
}
} else {
mix_setparentchild(m, SOUND_MIXER_VOLUME,
SOUND_MASK_PCM);
if (!(mask & SOUND_MASK_VOLUME))
mix_setrealdev(m, SOUND_MIXER_VOLUME,
SOUND_MIXER_NONE);
while ((ctl = hdac_audio_ctl_each(devinfo, &i)) !=
NULL) {
if (ctl->widget == NULL || ctl->enable == 0)
continue;
if (!HDA_FLAG_MATCH(ctl->ossmask,
SOUND_MASK_VOLUME | SOUND_MASK_PCM))
continue;
if (!(ctl->mute == 1 && ctl->step == 0))
ctl->enable = 0;
}
}
}
I guess what it does is iterate through the volume widgets and crank them up. ;)
I don't have the time right now to look into this more, but I thought
I'd just put this out there
if anyone had any comments (or an idea of how to implement this for our driver).
I am also trying to figure out how to implement mmap support; my audio
skips too much!
Regards,
--Blair
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